1. The problem statement, all variables and given/known data An Airbus A320 jetliner has a takeoff mass of 75,000 kg. It reaches its takeoff speed of 82 m/s in 35s. 2. Relevant equations F=ma V/t=a 3. The attempt at a solution I am completely lost on this question. I have seen numerous examples on the internet, with the exact problem, but no one has gotten the correct answer. After two hours and 20+ wrong answers I gave up and opted to see the answer. However, I would like to know how it was solved. Here is what I did that got me close to the right answer. Solved for acceleration indepentant of friction. Which was 82/35 giving me 2.343m/s^2. I plugged that in for f(thrust)=ma -> (75,000)(2.343) = 175,725 N. This is too low and doesn't involve rolling friction. From a table in my book I figured rolling friction was 0.020 for rubber on concrete. I then solved for the friction. m=75,000 g=9.80 f=0.020 F=ma -> F=(75,000)(9.80)(0.020) = 14,700N Since the thrust will have to include overcoming friction the whole time, I add those two values and get 190,425 N. This is the only way I can come close to the actual answer. I've done it a bunch of different ways, none were within 20k of the answer. How should one actually solve this? The answer given is 190,000N.